Ducati Evaporative Emissions
by Rick K. for webBikeWorld.com
Maintenance and Repair Article Index |
Blog Home | Owner Comments (Below)
The evaporative emissions canister mounted on
modern Ducati motorcycles is, in a word, ugly.
I have no idea why they mounted it in such an obvious
and noticeable location on the left-hand side of the
motorcycle, hanging off the engine in a location that's
as obvious as a wart on a nose.
I have not seen this canister on any of the Ducatis
in Europe, which meet the tough Euro 3 emissions
standards, and I don't know enough about the details of
U.S. vs. Euro emissions standards to know why the
canister is necessary in the U.S. and not in Europe
(Note: See comments
An evaporative emissions system is generally
designed to route fuel vapors from the fuel tank into a
carbon filter inside the canister. The canister is
then routed into the engine intake where the vapors are
merged with the normal fuel intake and burned in the
The evaporative emissions canister and system should
be checked occasionally to ensure proper operation.
Also, the owner may wish to eliminate variables when
tuning the motorcycle or when troubleshooting, and the
evaporative emissions system may have to be removed to
eliminate it as a potential variable when checking the
Ducati's fuel injection system or when balancing the
fuel and air mixture.
Although there are no moving
parts in the system, the Ducati owner may also find it
necessary to remove the system for maintenance, repair
If the vehicle has an evaporative emissions system,
it is considered to be part of the vehicle's air
pollution control system and is usually inspected during
any emissions tests. Note that it may be illegal
to run the motorcycle without the evaporative emissions
canister or if the vehicle's emissions control system
has been tampered with or modified.
Therefore, this article covers the removal of the
Ducati evaporative emissions canister and hoses for
maintenance, repair, testing or replacement.
There is no original information covered in the
article you are reading; details on removing the evaporative emissions
system on a Ducati can be readily found on several of
enthusiast websites like the
Ducati Monster List and others.
Removing the evaporative emissions canister on the
GT1000 is a relatively easy project and should take no
longer than 1/2 hour or so. The owner may want to
purchase two short M5 socket head cap screws with thin
5mm washers to plug the threaded holes in the engine's
intake system after the evaporative emissions system is
removed so that the engine can be tested or tuned
without a vacuum leak. (Update: These may be M6
screws on the Monster and other Ducatis).
The evaporative emissions system on the Ducati GT1000
consists of the canister (mounted on the
left-hand side of the engine) and a series of hoses as
shown in the photo at the top of this page. The
hoses are shown in the photo below with labels
indicating their routing.
One hose runs down from the fuel tank to the canister
and is attached to the top of the canister in the
location marked "To Fuel Tank Hose" in the photo below.
This hose must remain on the motorcycle and can be
routed down the chassis to evacuate a fuel tank
Another hose runs from the canister to the horizontal
(front) cylinder and one hose from the canister to the
vertical (rear) cylinder. The hoses running from
the canister to the cylinders are joined with a "T"
It's interesting to note that in addition to the hose
routing for the evaporative emissions system, the fuel tank on the
GT1000 also has an overflow hose that runs down from the
bottom of the tank and allows fuel overflow to spill out
on to the ground.
This hose completely bypasses
the evaporative emissions canister and system and, in
fact, the canister also includes an overflow hose.
So I'm puzzled as to how the evaporative emissions
system on the Ducati does indeed capture all of the fuel
vapor if the fuel is still allowed to bypass the
canister and spill on to the ground?
In any case, to remove the system, the hose leading
from the fuel tank to the top of the canister must be
removed at the canister. I then routed this down
the left-hand side of the frame, between the front
cylinder and the frame, along with a number of other
hoses that are bundled and routed towards the ground.
This keeps that hose out of the way and allows any fuel
overflowing from the fuel tank to spill on the ground
rather than the engine during testing.
By the way, don't overfill the GT1000 with fuel.
Enough room should be left in the top of the tank for
expansion if the weather turns warm. I filled the
tank right up to the top once and left the bike in the
garage, which became very hot one warm day. An
overpowering smell of gasoline hit me when I opened the
garage and I traced it to the overflow. The
situation could have been disastrous, so use caution
when filling the fuel tank.
UPDATE: I now
think the best way to finish the removal is to simply
cut the hose coming from the "T" down to the canister
and leaving all the other hoses intact. Plug the
end of the hose you just cut with a screw and some
silicone and then tuck all the hoses up under the bike.
This leaves the majority of the hoses and parts in place
just in case they're needed and it saves a lot of work.
And, the canister could be re-attached very easily if
Next, I then loosened the hose clamp (see photo below) that
secures the hose to the front cylinder intake.
This hose is routed to the front cylinder intake on the
right-hand side of the bike (1000DS engine).
This photo (below) is a close-up of the fitting that
is screwed into the front cylinder intake manifold.
The technician's hand is holding the hose that leads
back to the evaporative emissions canister and the hose
clamp can be seen towards the end of the hose.
The fitting shown in the photo above can now be
carefully removed. The intake manifold tube is
made from some type of plastic material which has a
metal threaded fitting to allow the nipple fitting shown
above to be screwed into place. Caution is
warranted when removing or replacing this fitting; don't
force it and don't use too much torque when replacing
After removing the nipple fitting, I replaced it with
an M5, fine thread hex head cap screw. I had to
use a Dremel cut-off tool to cut the M5 screw down to
size because I couldn't find a short screw in the
hardware store. The screw should only be as long
as the threaded part of the nipple fitting that was
removed. It's not a good idea to have a
screw protruding into the air stream inside the intake
manifold, as it may cause unwanted turbulence in the air
stream that may affect performance.
Next, I removed the hose and fitting from the rear
cylinder. This is located in a barely accessible on the
left-hand side of the bike, just near the evaporative
emissions canister. The next photo (below) shows a
close-up of this fitting. Note how the Wiha bit
driver is routed through the frame to access the screw.
I was only able to access this fitting using the
Wiha bit driver, which is a long, thin
screwdriver-like tool with a magnetic receiver on the
tip. It takes different size bits and has been
enormously handy for many motorcycle related projects.
This is the only tool I own that fits the hard-to-access
screws that hold the Ducati GT1000's rear taillight
assembly. I will cover the removal of that
assembly in an upcoming article.
I removed the hose and the nipple fitting on this
intake manifold tube and also replaced it with a
cut-down M5 hex head cap screw. I used blue
Loctite on both and did not over-tighten the screws.
The final step is to remove the canister bracket.
This is attached to the engine using the side cover
bolts. I had to add a couple of washers under the
top bolt to make up for the thickness of the bracket and
to prevent that bolt from bottoming out in its threaded
I don't have a shop manual for the GT1000, so I'm not
sure of the torque value for these bolts. I used a
bit of blue Loctite and just snugged them up. If
anyone can tell me the correct torque values, I will add
it to this article.
That's all there is to it... Although some owners say
that instead of replacing the nipples with M5 screws,
they should be left in the intake manifold tubes and a
hose should be run from one nipple to the other to
balance the intake manifolds. I did not do this
and the bike seems to run fine, but if anyone can shed
some light on this topic, please contact me.
If you have further information, tips or guidance on
this project, please send it to me at
►Your Comments and
Please send comments to
Comments are ordered from most recent to oldest.
Not all comments will be published (details
). Comments may be edited for
clarity prior to publication.
From "M.H." (3/09): "I just removed
the charcoal canister on a (2008 Ducati Hypermotard S).
I used two M5x10 Phillips screws from Ace Hardware with
a little blue Loctite on each. I'd have preferred
to use hex cap screws, but they were all too long.
And I didn't want to bother cutting/grinding the ends
off to shorten them. Worked like a charm, cost $1
and took about 15 minutes."
From "C.Y.": "Couple of comments.
One does not need to connector the two cylinders for
balance. Please see
my detailed post (on the Ducati Monster board).
Also, there seems to some confusion as the M5 or M6 is
the right screw. Is it because M5 goes with the GT
and the M6 goes with the S4RS?
Editor's Reply: I'm not sure if
different Ducatis use different size screws, but the
screws on both the GT1000 and Multistrada 620 use a 5mm
From "A.": "Regarding the
procedure for the charcoal canister removal for 2V
Ducati's, I would recommend using rubber vacuum plugs
instead of the 5mm bolts and Loctite, as the existing
nipple fittings are used for synching the throttle
bodies by the dealer or whomever. Also, I
connected the two overflow hoses using the existing 'T'
connector to make it more tidy and just have one hose
coming out. This would also prevent someone from
accidentally plugging up the overflow hose to the
canister, which has been known to happen."
From "A.I.B.": "You ponder in the
article why the canister is on US models. CARB
(California Air Resources Board - Ed.) compliance
requires an evaporative emissions system. The
other 49 states do not require it. To make things
simpler for the tiny Ducati factory, they only make one
US model and it is California compliant.
It can legally be removed in any other state, but any
bike owned in California must keep it, or be fined
Note: For informational use only. All material and
photographs are Copyright © webWorld International, LLC - 2000-2011. All
rights reserved. See the webBikeWorld®
page. NOTE: Product specifications, features and details may
change or differ from our descriptions. Always check before purchasing. Read
Terms and Conditions!